An Attitude Safety Control Scheme for Micro-Nano Satellites
A study is conducted on the problem of achieving attitude safety control under low redundancy in micro-nano satellite.A resource efficient attitude safety control scheme is proposed,which aims to cut off all potential fault sources as much as possible when diagnostic information is not in complete.Only magnetome-ter and magnetic torquer are used to reconstruct the satellite attitude control system.The proposed scheme can realize angular velocity damping under any initial attitude condition of the satellite,and can control the satellite maneuvering to the sun oriented attitude,which ensures the efficiency of the solar array char-ging and thus extends the satellite's lifespan under fault conditions.Mathematical simulation shows that e-ven when the main control components such as gyroscopes,star sensors and momentum wheels are not avail-able,the proposed scheme can still achieve stable single axis safe attitude control towards the sun,which a-chieves attitude determination precision by better than 2 degrees and the sun orientation precision by better than 5 degrees that greatly improves the satellite's safety operation ability in orbit.
Micro-nano SatelliteMagnetometerMagnetic torquerAttitude safety control
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